If you have the original recovery cd for this computer, not one from another make and model. It should boot up and go thru the re-installation of Windows. There has to be another reason that it is not. One of the reasons is that the new hard drive is not formatted correctly or is not being recognized by the computer. Here is what you do and I will give you a site to go to so you can see how to set up the drive select switches
What is Cable Select and How Do I configure my Seagate ATA Drive to Use It? = http://www.seagate.com/support/kb/disc/faq...ble_select.html
If your drive is not this one it does not matter what your are looking at is how to set up your drive properly for your system. If it is a boot drive it usually gets set to primary cable and the drive select gets set to master, this is usually shown on top of the drive and the page I sent you to will give you an idea of where the switched are.
After this your drive has to be partitioned and formatted. Most drives come with software to do this either on a CD-R or on the hard drive. You might need some one who has either done this before or knows how to do it. The explanation can get quite long for this, but when this is done your drive will be able to accept the Windows Recover disk and you will be all set.